The Ione City Council worked on a range of issues facing the city at their meeting last night.The Council approved a collection of changes to the construction plans for the City Sewer system. In the current phase of the project, the City is lining the bottoms of four treatment ponds in the hopes that it will end the infiltration of heavy metals into local groundwater.The changes, which were brought about by the fact the treatment ponds are deeper and more slug-filled than originally though, increasing the price of this phase by $240,000 to a total of $900,000.Overall the City has spent some six million dollars on the sewer plant.In other business, the Council approved the acceptance of a public easement for a storm water drain in the Castle Oaks development, a clean-up action from an earlier phase of the development.The Council also approved a refinancing of bonds for the City public improvement district, which will result in new residents of the city paying less interest on bonds for city improvements.Finally, the City approved the annual labor agreement with the City Police department.